Twelfth (?), a. [For twelft, OE. twelfte, AS. twelfta. See Twelve.]
1.
Next in order after the eleventh; coming after eleven others; -- the ordinal of twelve.
2.
Consisting, or being one of, twelve equal parts into which anything is divided.
© Webster 1913.
Twelfth, n.
1.
The quotient of a unit divided by twelve; one of twelve equal parts of one whole.
2.
The next in order after the eleventh.
3. Mus.
An interval comprising an octave and a fifth.
© Webster 1913.